Earth Day doesn't have to be a dull, obligatory tour of green duty, says ThinkGeek. Instead, this geek gear retailer is setting up the first ever carbon-offset Tron video arcade with a pledge to purchase credits against their in-office machine.

Here is how it will play out. The trusty Kill-A-Watt meter will calculate the electrical expenses and amount of carbon the machine uses. Meanwhile, ThinkGeek's Facebook and Twitter friends will get a chance to guess the final savings. The best guess coming closest without going over will win an eco-friendly gift pack and a ThinkGeek gift certificate.

Feel like doing something more consequential? Check out Call2Recycle and its remarkable e-waste recycling feat.

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